Help with Clen/T3 cycle needed

Hi Everyone,I am new to these forums, so please be patient. I have searched all of the related posts prior, but have a specific question about a T3/Clen fat loss cycle. My goal is to lose 25 lbs + maintain as much of my existing muscle as possible.

I plan to run a Clen/T3 for 21 day cycle(s). Everyone tells me that I should run Test E or Test C 500/mcg week due to the catabolic properties of the T3/Clen. If I did not want to run an AAS (or did not have a source) what prohormone(s)/designer supplements would you recommend to help me preserve muscle while cutting?